#include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <fcntl.h>
    #include <limits.h>
    #include <sys/types.h>
    #include <sys/stat.h>

    #define FIFO_NAME "/tmp/myfifo"
    #define BUFFER_SIZE PIPE_BUF


    int main()
    {
        int pipe_fd;
        int res;

        int open_mode = O_RDONLY;
        char buffer[BUFFER_SIZE + 1];
        int bytes = 0;

        memset(buffer, 0, sizeof(buffer));

        printf("Process %d opeining FIFO O_RDONLY \n", getpid());
        pipe_fd = open(FIFO_NAME, open_mode);//判断打开文件是否成功
        printf("Process %d result %d\n", getpid(), pipe_fd);

        if (pipe_fd != -1) {
            do {
                res = read(pipe_fd, buffer, BUFFER_SIZE);
                bytes += res;
            } while (res > 0);
            close(pipe_fd);
        } else {
            exit(EXIT_FAILURE);
        }

        printf("Process %d finished, %d bytes read\n", getpid(), bytes);
        exit(EXIT_SUCCESS);
    }